Drafting instrument.



P. OLMSTED.

DRAFTING INSTRUMENT.

APPLICATION FILED IAN. 24. 1914.

Patented June 15,1915.

8 El! L7 /710e22/0r THE NORRIS PETERS 00.. PHOTC-LITHCL. WASHINGIUN. D. C.

PERRY OLMSTED, or Los ANGELEs. CALIFORNIA.

DRAIETING INSTRUMENT.

ideaset.

Specification of'Letters Patent.

Application filed January 24., 1914. Serial no. 814,091.

To ailwiiomit may concern: Be it known that I, PERRY OLMs'rnD, a

' citizen of theUnited States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Drafting Instrument, of which the following is a specification.

This invention 1S3 draftmg instrument.

One of the objects of the invention-is to provide a single drafting instrument adapted to be used in drawing horizontal, vertlcal, and angular hues and for taking measures in all directions and from any desired point,

on a drafting board.

Another object isto provide a drafting instrument of this type which will be easier and more convenient for a" draftsman to handle than the ordinary T square, triangle, and ruler used, for the purpose for which this invention is designed, and by means of which greater accuracy and speed may be attained than by the instruments now in'use.

In the accompanying drawings forming part of this specificatiom-Figurel is a plan view of my'invention; shown in full lines in position for drawing horizontaland vertical lines and for taking horizontal and vertical measures, and in dotted lines in position for drawing angular lines and for taking angular measures. Fig. 2 is a sectional view of a detail of construction taken on the line 20 -40 of Fig; 1. Fig. 3 is a sectional view of a detail of construction taken on line an -m of Fig. 1. Fig. 4 is a transverse sectional view of my invention taken on line 02 of Fig. 1.

Referring to the structure of my inven tion, 1 indicates a rod extending across a drawing board 2 near the left edge thereof and parallel to said edge, which rod is slidably mounted in detachable clamp brackets 3, clamped respectively by screws 4 to the edge of the board adjacent the draftsman and the edge opposite to said edge. A set screw 5 is located in one of the brackets 3 which is adapted to engage the rod 1 to hold it against sliding and turning. A sliding frame 6 comprising upper member 7 and lower member 8 is slidably mounted upon rod 1 by means of hangers 9 forming part of the upper frame member Tthrough which hangers said rod extends. A disk 10 is formed on the lower frame member 8, upon which disk rests a disk 11, formed on the upper frame member 7. A screw 12 extends through said disks, and abutterfly nut 13 is desired to move the screws onthe upper end of'said screw and engages the disk 11, whereby the lower frame member 8is swiveled to theupper frame member 7 The disk 10 is larger in diameter than the disk 11 and is provided with'a scale 14 0f angular degrees. The disk 11 is provided with an arrow 15 point ing to the-scale 14which isadapted to point to the character indicating the degree of the angle atwhich the upper disk 10 is turned with relation to the disk 11. A'rod 16 forming part of the frame member 8 is so located on said frame member as to rest close to the board 2. A coupling 17 is secured to the rod 16 near one end thereof, and a coupling 18 is slidably mounted upon said rod, to which couplings are pivoted the ends of the levers 20 and 21at one end of the lazytongs 25. The ends of the levers 29 and 30 at the other end of the lazy tongs are pivoted respectively at 31 and 32 to a measuring element 35 andto a slidingblock 36, slidablymounted in guide 37 secured to said element. The

measuring element through the lazy tongs moves with the frame 6. The guide 37 covers the pivot connections 31 and 32 of the levers 29 and so that they will not be in the way of the draftsman using the instrument. The measuring element is provided with straight edges 40 and 41 against which a pencil or pen is adapted to be placed to draw straight lines. Scales 42 and 43 are provided along the edges 40 and 41 respectively by means of which measures may be taken. A scale 45 is provided along the rod 1 for measuring distances at which it element 35 vertically, distances may be measured A set screw extends whereby vertical by said element.

through one of the hangers 9 and engages the rod 1, whereby the frame 6 may be secured to the rod 1 in any position along the rod.

The operation of my invention is as follows: As illustrated in full lines in the draw- -ing, the angle at which the measuring element 35 rests is zero, whichis indicated by the registration of the arrow 15' on disk 11 with 0 of the scale 14 on disk 10. In this position of the measuring element, horizontal lines may be drawn along the edges 41 and vertical lines may be drawn along the edge 40 of said element, and horizontal measures may be taken with the scale 43 and vertical measures may be taken with the scale 42. The sliding coupling 18 and the wr cart-on H ratemea June 15,1915;

sliding block 36 permit the levers or the lazy tongs 25 to be brought together'or drawn apart, so that the measuring element 35 may be moved in the direction of the axis of extension and contraction of said lazy tongs, horizontal line, the element 35' and lazy tongs 25 are maintained .in the 1 position shown in full lines in Fig. 1 of the drawing, 5-. 6.. with the arrow on disk 11 pointing to 0 on disk 10, in which position the axis her 8, lazy tongs 25, and element swung to the desired angle and are clamped in such 7 position by tightening nut 13, as illustrated in dotted lines in Fig. 1 of the drawing. Angular lines may be drawn and angular measures may be taken with the element 35 in angular position, in the same manner as when the element 35 is in a horizontal position. For example, when the element 35 is at an angle of 30, angular lines of 30 be drawn along the edges ll of element If it be desired to draw a long,

35, and by moving the element in the direction of the axis of extension and contraction ofthe lazy tongs 25, (which inthis position of element 35 is at an angle of 30 also) long lines at an angle of 30 may be Z drawn, and measures along lines of 30 may be taken wlth scales 4E3, Wl'lllG llnes of 60 may be drawn alongithe edge 40, and

measures along lines of. 60 may be ;taken with scale 42. Vertical measures'may be taken above and below the element 35 and scale 42, by moving the frame 6 along the rod lruntil the hanger 9 adjacent the scale registers with the desired measure on said scale. 1

WVhat I claim is: p A drafting mstrument comprising a support adapted to be attached to' a drawing board, a frame comprising two members, one member being mounted upon said support, the other member being swiveled to said first member, a measuring element, and

lazy tongs connecting said second frame member to said measuring element.

In testimony whereof, I have'hereunto set my hand at Los Angeles, California, this 16th day of January, 1914..

' PERRY OLMSTED.

In presence of' p 7 GEORGE T. HAOKLEY,

LORRAINE E. DURROW.

' Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' V Washington, D. G. V i 

